Hey Monika1949!
Here is an article that will help you understand how to use Home Sharing on your Apple TV:
Setting up Home Sharing for Apple TV (2nd generation and 3rd generation)
http://support.apple.com/kb/ht4352
You will need to sign in to the iTunes store on your Apple TV as well. Here is an article that explains where to do that:
How to rent a movie from the iTunes Store on Apple TV
http://support.apple.com/kb/ht1498
- From the main Apple TV menu, choose Settings > iTunes Store.
If your location and iTunes account already appear here, skip to the next section.
- Select Location.
- Scroll to highlight your location and select it.
- Press the Menu button on the remote once to return to the previous screen.
- Select Sign in.
- Enter your Apple ID and password. If you don't have an Apple ID, create one using iTunes on your computer. (The password is case-sensitive.) Note: If your Apple ID is an AOL account, you'll need to convert it to work with Apple TV. If you need help converting your AOL account, please contact iTunes Store Customer Service.
- Apple TV will give you the option to remember your password. Select Yes if you want to save the password.
- Press and hold the Menu button to return to the main Apple TV menu.
Thanks for coming to the Apple Support Communities!
Regards,
Braden